/*
 * Copyright 2021 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "modules/skottie/src/effects/Effects.h"

#include "modules/skottie/src/Adapter.h"
#include "modules/skottie/src/SkottieValue.h"
#include "modules/sksg/include/SkSGPaint.h"
#include "modules/sksg/include/SkSGRenderEffect.h"
#include "src/utils/SkJSON.h"

namespace skottie::internal {
namespace {
class DirectionalBlurAdapter final : public DiscardableAdapterBase<DirectionalBlurAdapter, sksg::ExternalImageFilter> {
public:
    DirectionalBlurAdapter(const skjson::ArrayValue &jprops, const AnimationBuilder &abuilder)
        : INHERITED(sksg::ExternalImageFilter::Make())
    {
        enum : size_t {
            kDirection_Index = 0,
            kBlurLength_Index = 1,
        };


        EffectBinder(jprops, abuilder, this).bind(kDirection_Index, fDirection).bind(kBlurLength_Index, fBlurLength);
    }

private:
    void onSync() override
    {
        const auto rot = fDirection - 90;
        auto filter =
            SkImageFilters::MatrixTransform(SkMatrix::RotateDeg(rot), SkSamplingOptions(SkFilterMode::kLinear),
            SkImageFilters::Blur(fBlurLength * kBlurSizeToSigma, 0,
            SkImageFilters::MatrixTransform(SkMatrix::RotateDeg(-rot), SkSamplingOptions(SkFilterMode::kLinear),
            nullptr)));
        this->node()->setImageFilter(std::move(filter));
    }

    ScalarValue fDirection = 0;
    ScalarValue fBlurLength = 0;

    using INHERITED = DiscardableAdapterBase<DirectionalBlurAdapter, sksg::ExternalImageFilter>;
};
} // namespace

sk_sp<sksg::RenderNode> EffectBuilder::attachDirectionalBlurEffect(const skjson::ArrayValue &jprops,
    sk_sp<sksg::RenderNode> layer) const
{
    auto imageFilterNode = fBuilder->attachDiscardableAdapter<DirectionalBlurAdapter>(jprops, *fBuilder);
    return sksg::ImageFilterEffect::Make(std::move(layer), std::move(imageFilterNode));
}
} // namespace skottie::internal
